Run a function repeatedly on a specific interval

later.js

/**
 * Run a function repeatedly on a specific interval
 * @param {function} fn callback to run
 * @param {number} interval time in ms between runs
 * @param {boolean} immediate
 * @param {...n} args
 * @returns {object} timer object.  Call cancel() to stop timer
 */
later: function(fn, interval, immediate, args) {
	var cbArgs = _.toArray(arguments).slice(3);

	if (immediate) {
		fn.apply(this, cbArgs); // Run once immediately
	}

	var wrapper = function() {
		fn.apply(this, cbArgs);
	}
	var timeoutId = setInterval(wrapper, interval);

	return {
		timeoutId: timeoutId,
		cancel: function() {
			clearInterval(timeoutId);
		}
	}
}